Namiuchigiwa no Muromi-san
One day, Mukoujima Takurou, a boy in high school who loves fishing, catches a pig tailed mermaid called Muromi-san who speaks in the Hakata dialect. She comes to visit Takurou often, along with her fellow mermaids Sumida-san, Fuji-san, Levia-san, Hii-chan, and even some other fantastical creatures such as Yeti and Harpy!
(Source: Crunchyroll)
Episode 1 - Muromi-san on the Brink
Episode 2 - Muromi-san and the Legendary Sea Creatures
Episode 3 - Muromi-san and Old Memories
Episode 4 - Muromi-san and the Food Chain
Episode 5 - Muromi-san and Twin Mountain
Episode 6 - Muromi-san and Ryuuguujou
Episode 7 - The Boy, Kappa, and Muromi-san
Episode 8 - Muromi-san and the Nice(?) Type
Episode 9 - Muromi-san and the Secret Advanced Civilization
Episode 10 - Muromi-san Worldwide
Episode 11 - Muromi-san and the Chill
Episode 12 - Muromi-san and Different Forms of Love
Episode 13 - The Years Go By Muromi-san